CN102777226B - Continuous variable valve stroke mechanism of engine - Google Patents
Continuous variable valve stroke mechanism of engine Download PDFInfo
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- CN102777226B CN102777226B CN201210254161.4A CN201210254161A CN102777226B CN 102777226 B CN102777226 B CN 102777226B CN 201210254161 A CN201210254161 A CN 201210254161A CN 102777226 B CN102777226 B CN 102777226B
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- camshaft
- rocker arm
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- 230000007246 mechanism Effects 0.000 title claims abstract description 14
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 6
- 230000000712 assembly Effects 0.000 abstract description 5
- 238000000429 assembly Methods 0.000 abstract description 5
- 239000000446 fuel Substances 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract 2
- 238000005516 engineering process Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
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- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 238000002347 injection Methods 0.000 description 1
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Abstract
Disclosed is a continuous variable valve stroke mechanism of an engine. The mechanism is used for improving power performance, fuel economic performance and discharge indexes of vehicles. The mechanism comprises a driving assembly, a transmission unit and a valve assembly and is characterized in that the driving assembly comprises a camshaft and a compensation camshaft, under the control of an electronic control unit (ECU) of an engine, a stepping motor drives the compensation camshaft to control valve stroke, the transmission unit comprises a group of hinged type rocker arm assemblies, the number of the rocker arm assemblies is matched with the number of engine cylinders, and the rocker arm assemblies, the camshaft and the compensation camshaft are assembled. By the aid of the rocker arm assemblies which are in a hinged structure, the variable of the valve stroke is increased, the car power and the fuel economy are improved well, and the discharge performance of engines is improved.
Description
Technical field
The present invention relates to a kind of motor car engine continuous variable valve lift mechanism, belong to technical field of engines.
Background technique
Along with the progress of auto manufacturing technology, the requirement of Consumer to aspects such as vehicle dynamic quality, Economy, riding comfort and exhaust indexs improves constantly, and proposes new challenge to the research and development of automobile new product.For promoting the power performance and the economy performance of motor, realize motor low emission target, turbosupercharging, VVT (Variable Valve Time), VVL(lift range variable), in-cylinder direct injection, the advanced technologies such as variable vortex receive much concern, especially lift range variable technology is used widely in Europe and Japan and develops, but the enforcement difficulty of this technology is larger, the pattern adopting double-cam molded line to coordinate with control actuator to great majority is to realize the change of valve lift, there is complex structure, camshaft quality is large, processing difficulties, the defect that application cost is high, seriously constrain the application of this technology on automobile, affect the development of general-utility car.
Summary of the invention
The object of the invention is to the power character for improving vehicle, fuel consumption and emission performance, providing that a kind of structure is simple, reliable performance, processing cost are low, be convenient to the engine continuous variable air valve lift range mechanism implemented.
Problem of the present invention realizes with following technical proposals:
A kind of engine continuous variable air valve lift range mechanism, it comprises driven unit, gear unit and valve assembly, its specialization is, described driven unit comprises camshaft and compensates camshaft, described compensation camshaft is under the control of Engine ECU, realize control to valve lift by driving stepper motor, described gear unit comprises the hinge rocker arm assembly that one group of quantity is mated with engine cylinder number, described rocker arm assembly and camshaft and to compensate camshaft equipped.
Above-mentioned engine continuous variable air valve lift range mechanism, described rocker arm assembly is arranged on engine cylinder and covers in the rocker arm assembly mounting groove of setting, it is made up of upper rocker arm, lower shake-changing arm, rocking arm coupling shaft and reset jump ring, described upper rocker arm upper end is provided with and the circular arc camber compensating camshaft molded line and mate, it is hinged that rocking arm coupling shaft is passed through in the lower end of upper rocker arm and the upper end of lower shake-changing arm, described reset jump ring is sleeved on outside rocking arm coupling shaft, and two ends are arranged on inside the upper rocker arm jump-ring slot of upper rocker arm lower end setting and the lower shake-changing arm jump-ring slot of lower shake-changing arm upper end setting respectively.。
Above-mentioned engine continuous variable air valve lift range mechanism, by Transmitted chains transferring power between described camshaft and engine crankshaft, camshaft is all in continuous duty in all operating modes of engine running, and the cam profile of camshaft contacts with upper rocker arm lower end and lower shake-changing arm upper side.
Above-mentioned engine continuous variable air valve lift range mechanism, described valve assembly comprises valve and tappet, and described tappet is positioned at valve stem top, and the lower shake-changing arm lower end of tappet upper-end surface and transmitting assemblies is equipped with.
The present invention is by camshaft and compensate the function that camshaft actuated rocker arm assembly realizes valve lift continuous variable.Wherein, camshaft is identical with action rule with the function of common engine camshaft, when small engine load and idling operation, compensate camshaft not work, promote rocker arm assembly by camshaft, the upper rocker arm of rocker arm assembly and lower shake-changing arm are relatively rotated, lower shake-changing arm drives tappet and valve to pump, realize the opening and closing of valve, complete motor inlet and outlet function; When motor high load working condition, by Engine ECU control step motor action, cam axle several angle is compensated by driving stepper motor, the top of compensation camshaft is coordinated with rocker arm assembly, valve lift increases, and air inflow increases, and meets the requirement of motor high load working condition, increase power and the moment of torsion of motor, improve power character and the Economy of motor.In the present invention, because the frequency of okperation compensating camshaft is lower, structural design is comparatively simple, and processing cost is low, has very strong practicability; The present invention, by the rocker arm assembly of hinging structure, makes the Variable quantity of valve lift larger, better can promote the power performance and the economy performance of automobile, improve the emission performance of motor.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 be structure of the present invention and with power source driving relationship schematic diagram.
Fig. 2 is the structural representation of the present invention when valve-closing state;
Fig. 3 is the structural representation of the present invention when valve opening maximum lift state;
Fig. 4 is rocker arm assembly assembly relation schematic diagram;
Fig. 5 is the rocking arm mounting groove assembly relation plan view on rocker arm assembly and cylinder cap.
In figure, each label is: 1, compensate camshaft, 2, upper rocker arm, 2-1, upper rocker arm jump-ring slot, 2-2, circular arc camber, 3, lower shake-changing arm, 3-1, lower shake-changing arm jump-ring slot, 4, valve, 5, tappet, 6, camshaft, 7, reset jump ring, 8, rocking arm coupling shaft, 9, engine cylinder cover, 9-1, rocker arm assembly mounting groove, 10, stepper motor, 11, Engine ECU, 12, engine crankshaft, 13, Transmitted chains.
Embodiment
Referring to Fig. 1, Fig. 2, Fig. 3, the present invention includes driven unit, gear unit and valve assembly, its specialization is, described driven unit comprises camshaft 6 and compensates camshaft 1, described compensation camshaft 1 is under the control of Engine ECU 11, driven by stepper motor 10 and realize control to valve lift, described gear unit comprises the hinge rocker arm assembly that one group of quantity is mated with engine cylinder number, described rocker arm assembly and camshaft 6 and to compensate camshaft 1 equipped.
Referring to Fig. 4, Fig. 5, rocker arm assembly of the present invention is arranged in the rocker arm assembly mounting groove 9-1 that engine cylinder cover 9 is arranged, it is by upper rocker arm 2, lower shake-changing arm 3, rocking arm coupling shaft 8 and reset jump ring 7 form, described upper rocker arm 2 upper end is provided with and the circular arc camber 2-2 compensating camshaft 1 molded line and mate, it is hinged that rocking arm coupling shaft 8 is passed through in the lower end of upper rocker arm 2 and the upper end of lower shake-changing arm 3, described reset jump ring 7 is sleeved on outside rocking arm coupling shaft 8, two ends are arranged on inside the upper rocker arm jump-ring slot 2-1 of upper rocker arm lower end setting and the lower shake-changing arm jump-ring slot 3-1 of lower shake-changing arm upper end setting respectively.
Referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4, working principle of the present invention is:
The present invention drives rocker arm assembly to realize the function of valve lift continuous variable by camshaft 6 and compensation camshaft 1, and wherein, camshaft 6 is identical with action rule with the function of common engine camshaft.
When small engine load and idling operation, compensate camshaft 1 not work, camshaft 6 promotes rocker arm assembly, the upper rocker arm 2 of rocker arm assembly is relatively rotated with lower shake-changing arm 3, lower shake-changing arm 3 drives tappet 5 and valve 4 to pump, realize the opening and closing of valve 4, complete motor inlet and outlet function.Specific works step is: a, motor are in intake process, and camshaft 6 coordinates engine crankshaft 12 to move to promote rocker arm assembly to the right, and the upper rocker arm 2 of rocker arm assembly is relatively rotated with lower shake-changing arm 3, and lower shake-changing arm 3 is descending pushes valve 4 air inlet open; B, in the compression process that engine piston is up, along with the rotation of camshaft 6, close 4 at the up drive valve of the lower shake-changing arm 3 of the effect lower shake-changing arm assembly of rocking arm reset jump ring 7 and close.
When motor high load working condition, the action of Engine ECU 11 control step motor 10, compensation camshaft 1 is driven to turn an angle by stepper motor 10, the different parts of the outer profile line of compensation camshaft 1 is coordinated with rocker arm assembly, valve lift increases, air inflow increases, and meets the requirement of motor high load working condition.Specific works step is: c, motor are in intake process, and camshaft 6 characteristics of motion is constant, compensates camshaft 1 and coordinates camshaft 6 to do corresponding motion, promotes rocker arm assembly entirety and moves down, and increases aperture and the stroke of intake valve; D, in the compression process that engine piston is up, compensate camshaft 1 coordinate camshaft 6 action, the closedown of valve 4 can be completed smoothly.
The present invention is that the rocker arm assembly that can be changed by upper and lower two ends crow flight distance realizes valve lift continually varying with the cooperation compensating camshaft 1, do not need complicated control mechanism and the camshaft of high difficulty of processing, there is the feature that structure is simple, reliable performance, processing cost are low, be convenient to enforcement compared with the prior art of home and abroad, meet the requirement of power performance under the various operating mode of motor and economic performance, reduce the exhaust index of motor.
Claims (2)
1. an engine continuous variable air valve lift range mechanism, it comprises driven unit, gear unit and valve assembly, it is characterized in that, described driven unit comprises camshaft (6) and compensates camshaft (1), described compensation camshaft (1) is under the control of Engine ECU (11), the control realized valve lift is driven by stepper motor (10), described gear unit comprises the hinge rocker arm assembly that one group of quantity is mated with engine cylinder number, described rocker arm assembly and camshaft (6) and compensate camshaft (1) be equipped with;
Described rocker arm assembly is arranged in the upper rocker arm assembly mounting groove (9-1) arranged of engine cylinder cover (9), it is by upper rocker arm (2), lower shake-changing arm (3), rocking arm coupling shaft (8) and reset jump ring (7) composition, described upper rocker arm (2) upper end is provided with and the circular arc camber (2-2) compensating camshaft (1) molded line and mate, it is hinged that rocking arm coupling shaft (8) is passed through in the lower end of upper rocker arm (2) and the upper end of lower shake-changing arm (3), described reset jump ring (7) is sleeved on rocking arm coupling shaft (8) outside, two ends are arranged on the upper rocker arm jump-ring slot (2-1) of upper rocker arm lower end setting and lower shake-changing arm jump-ring slot (3-1) the inside of lower shake-changing arm upper end setting respectively,
By Transmitted chains (13) transferring power between described camshaft (6) and engine crankshaft (12), camshaft (6) is all in continuous duty in all operating modes of engine running, and the cam profile of camshaft (6) contacts with upper rocker arm (2) lower end and lower shake-changing arm (3) upper side;
When small engine load and idling operation, compensate camshaft not work, rocker arm assembly is promoted by camshaft, the upper rocker arm of rocker arm assembly and lower shake-changing arm are relatively rotated, lower shake-changing arm drives tappet and valve to pump, realize the opening and closing of valve, complete motor inlet and outlet function; When motor high load working condition, by Engine ECU control step motor action, cam axle several angle is compensated by driving stepper motor, the top of compensation camshaft is coordinated with rocker arm assembly, valve lift increases, air inflow increases, and meets the requirement of motor high load working condition, increases power and the moment of torsion of motor.
2. a kind of engine continuous variable air valve lift range mechanism according to claim 1, it is characterized in that, described valve assembly comprises valve (4) and tappet (5), and described tappet (5) is positioned at valve (4) top, and the lower shake-changing arm lower end of tappet (5) upper end and rocker arm assembly is equipped with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210254161.4A CN102777226B (en) | 2012-07-23 | 2012-07-23 | Continuous variable valve stroke mechanism of engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210254161.4A CN102777226B (en) | 2012-07-23 | 2012-07-23 | Continuous variable valve stroke mechanism of engine |
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| Publication Number | Publication Date |
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| CN102777226A CN102777226A (en) | 2012-11-14 |
| CN102777226B true CN102777226B (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210254161.4A Expired - Fee Related CN102777226B (en) | 2012-07-23 | 2012-07-23 | Continuous variable valve stroke mechanism of engine |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103089365B (en) * | 2013-02-28 | 2015-05-06 | 长城汽车股份有限公司 | Actuating mechanism of variable valve stroke drive device for engine |
| CN103266928B (en) * | 2013-05-23 | 2015-06-03 | 罗建民 | Two-in-one mechanism of continuous variable valve stroke and valve timing of automobile engine |
| CN104131854B (en) * | 2014-06-23 | 2017-02-22 | 贾开继 | Technique capable of continuously changing timing, phase and lift of valve of engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4723516A (en) * | 1985-11-25 | 1988-02-09 | Slagley Michael W | Valve open duration and timing controller |
| JP2007127117A (en) * | 2005-10-04 | 2007-05-24 | Masaaki Yoshikawa | Valve system apparatus for four-stroke internal combustion engine |
| CN101004150A (en) * | 2007-01-18 | 2007-07-25 | 孙海潮 | Method for changing motion regulation of execution piece controlled by cam |
| CN201874632U (en) * | 2010-04-29 | 2011-06-22 | 朱譞晟 | Fully variable valve timing gear containing variable-speed swing mechanism |
| CN102155273A (en) * | 2011-04-08 | 2011-08-17 | 奇瑞汽车股份有限公司 | Variable gas distribution mechanism of engine |
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Granted publication date: 20141224 |